The green bond market has seen explosive growth in the past decade, presenting an unrivaled opportunity in climate finance. Annual issuance has now risen from zero to more than $155 billion globally, with more growth ahead. But in emerging markets, the green bond era is just beginning. Combating climate change is one of the greatest challenges of our time, requiring far more financing than governments alone can provide. Yet there is good news. Climate change is increasingly viewed as a business opportunity, opening many profitable ways for investors to help protect the planet.